How to create a new brep from the exist brep?

Rhino Developer
1

Hi everyone,

For some reason, I must create a new brep from the exist brep, and I know the exist Brep is “read only”, so I new a brep to copy 2dcurve, 3d curve, …from the exist brep, but the vertex is always could not be copy? why? could anyone help me?

Best Regards,
Jerry

2

update…I do not want using brep.Duplicate()…because I must change the
property of brep.Face(0)